Magneto electric ignition apparatus



(3st. 2:), 1932. F. ALLENDORFF EAGNETO ELECTRIC IGNITION APPARATUS Filed Dec. 5, 19-32.

Fig. I

Patented Oct. 25, 1932 UNITED STATES PATENT OFFICE FRITZ ALLENDOBH, 01' BTUTTGABT, GERMANY, ASSIGNOB TO ROBERT BOSCH AKTIEN- GEBELLSOHAIT, OI STUTTGART, GERMANY IAGNETO ELECTRIC IGNITION APPARATUS Application filed December 5, 1931, Serial No.

The invention relates to magneto electric ignition apparatus in which springs, for ex ample, for contacts and the like, are arranged in proximity to the high tension winding. It has been found that such springs, at the points which lie nearest to the high tension winding, become very much oxidized under the action of the silent discharges which proceed from these coils, owing to the nitrogen oxide which is produced by the discharge. The nitrogen oxide in combination with moisture forms nitrous acid, which attacks the springs, so that they break comparatively soon at the places in question. Accordin to the invention, this drawback is removed by the springs being surrounded by a metallic sheat An example of construction of the invention is illustrated in the drawing, in which Figure 1 is a view of an armature of a magneto in part section.

Figure 2 is an end elevation of the armature cover.

Inthe drawin 1 denotes the armature cover or shroud o a magneto armature. In this latter a condenser 2 is provided in known manner which is held b spring pressure plate 3 in the recess 4 of t e armature cover. This pressure plate is screwed to lugs 5 on the armature cover. A copper sleeve 6 encloses the ressure plate, and owing to the lgressure o the plate 3 on the condenser is eld firmly in position. The sleeve 6 is made a ribbon of copper helically wound round b a out the plate 3. The armature cover 1 is screwed in known manner to the armature pole shoes 7 between which the armature winding 8 is placed. The distance of the pressure plate 3 from the high tension wind ing 8 is kept as small as possible with a View to the best utilization of space.

By reason of the enclosing copper sleeve 6 the intimation of nitrous acid is removed from the surface of the spring 3 to the sur face of the metallic sleeve because an electric fieid originating from the coil can no longer exist within this sheath. Any charge on the sleeve 6 flows to earth through the spring 3.

I declare, that What I claim is:

1. A magneto including a condenser, a

578,836, and in Germany December 10, 1930.

FRITZ ALLENDORFF. 

